The now famed American poetess, Sylvia Plath (Gwyneth Paltrow) is a Fulbright scholar at Cambridge, England in 1956. Angered over a stinging review of her work by the literary roué Ted Hughes (Dennis Craig), she is then charmed by his poetry and blatantly sets out to seduce him. They marry soon after.

Sylvia had tried to commit suicide several times in her youth. Recalling one terrifying near miss, her cold-seeming mother resents Hughes, sensing the power in passionate love to harm her fragile, brilliant daughter. The initially torrid life that Ted and Sylvia share in both America and in rural Britain, grows tired through the strain of two children, her lack of joy in teaching, and his greater poetic success, all of which seem to stifle her creativity.

It ends because of his chronic infidelities, reduced in this version to a committed affair with a mutual friend, the thrice-married, Assia Wevill (Amira Casar), who becomes pregnant. Rage, jealousy, and depression become Sylvia’s muse. The more she suffers with Hughes, the more productive and poignant is her work. Unable to lure him back, she leaves buttered bread and milk for her children, seals the kitchen, and gasses herself to death.